"The Wilshire Micro-Cap ETF* (NYSE: WMCR), (the ""Fund""), seeks investment results that correspond generally to the performance, before the Fund’s fees and expenses, of an equity index called the Wilshire US Micro-Cap IndexSM (the “Wilshire Micro-Cap” or the “Index”). The Wilshire Micro-Cap is a rules-based index comprised of, as of July 31, 2010, approximately 1,597 securities of micro-capitalization companies, as defined by Wilshire Associates Incorporated (“Wilshire” or the “Index Provider”). The Wilshire Micro-Cap is designed to represent micro-sized companies and is a subset of the Wilshire 5000 Total Market IndexSM (the “Wilshire 5000”). The Wilshire Micro-Cap represents a float-adjusted, market capitalization-weighted index of the issues ranked below 2500 by market capitalization of the Wilshire 5000. Under normal conditions, the Fund will invest at least 80% of its assets in securities of micro-capitalization companies. In addition, the Fund will normally invest at least 80% of its total assets in equity securities that comprise the Index. *Prior to August 20, 2010, the Fund's name was Guggenheim/Sabrient Stealth ETF and the Fund sought to replicate an index called the Sabrient Stealth Index." *Prior to August 20, 2010, the Fund's name was Claymore/Sabrient Stealth ETF and the Fund sought to replicate an index called the Sabrient Stealth Index.
See more details on sponsor's website